【摘要】 为了减少联合收获机收获过程中水箱“开锅”现象的发生，延长收获机的无故障工作时长，对4LXZ-8F型联合收获机的发动机风冷系统散热量进行了计算，并基于计算结果对防尘罩、散热器进行了优化设计，对冷却风扇进行了匹配选型。利用SolidWorks对优化前后风冷系统进行了三维建模，利用Fluent软件对发动机风冷系统优化前和优化后散热器散热性能分别进行仿真分析。仿真结果表明：优化前的冷却水入口温度为90℃,出口温度为72.3℃,进出口温差为17.7℃;优化后的冷却水入口温度为90℃,出口温度为71.1℃,进出口温差为18.9℃,表明优化后散热器散热性能提升了6.78%。研究成果可为提高发动机风冷系统的散热性能，延长无故障收获时长提供理论指导。更多还原

【Abstract】 In order to reduce the boiling phenomenon of water tank in the harvesting process of combine harvester and prolong the trouble free working time of harvester.In this paper, the heat dissipation of the engine air cooling system of the 4LXZ-8F combine harvester was calculated.Based on the calculation results, the dust cover and radiator were optimally designed, and the cooling fan was matched and selected.The 3D modeling of the air cooling system before and after optimization was carried out using Solidworks the Fluent software was used to simulate and analyze the heat dissipation performance of the radiator before and after the optimization of the engine air cooling system.The simulation results show that the cooling water inlet temperature before optimization is 90℃, the outlet temperature is 72.3℃, and the temperature difference between the inlet and outlet is 17.7℃.The optimized cooling water inlet temperature is 90 °C, the outlet temperature is 71.1°C,and the inlet and outlet temperature difference is 18.9°C which proved that the heat dissipation performance of the optimized radiator is improved by 6.78%.The research results of this paper provide theoretical guidance for improving the heat dissipation performance of the engine air-cooling system and prolonging the trouble-free harvest time.更多还原